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In-situ Creep Behavior of Expansive Soils Based on Pressuremeter Test
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In-situ Creep Behavior of Expansive Soils Based on Pressuremeter Test
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Journal Article
In-situ Creep Behavior of Expansive Soils Based on Pressuremeter Test
2024
Overview
Landslides frequently occur at expansive soil slopes with characteristics of gradualness and chronicity that are related to the time-effect deformation, so it is crucial to study the creep behavior of expansive soils. Menard pressuremeter was used to conduct short-term tests and long-term creep tests on expansive soils at Nanyang, China, in order to analyze the in-situ behavior of expansive soils. The results of short-term tests show that the initial pressure, yield pressure, and limit pressure all increase with the increase of testing depth. The results of long-term creep tests show that: (1) Under low applied pressure, only instantaneous deformation and decay creep occur. However, when the pressure level reaches a certain value, the soil fails owing to excessive deformation within a few minutes, and different from the results of triaxial loading creep tests, there is no apparent accelerated deformation stage before the failure. (2) The expansive soil has nonlinear creep characteristics, and the boundary pressure of the linear and nonlinear characteristics is around the yield pressure. Besides, a nonlinear creep model for the pressuremeter test is proposed, which can well describe the in-situ creep behavior of expansive soils. This model can also give the critical pressure for the failure of expansive soils, which is between yield pressure and limit pressure. Hence, it is advised to monitor the pressure to be lower than the yield pressure, and to monitor the deformation of expansive soil slope in practical engineering projects to avoid disasters caused by excessive deformation.
Publisher
Springer International Publishing,Springer Nature B.V
